#5155B3
Closest named color: Iris (#6258C4). oklch(49.6% 0.146 277.8), rgb(81, 85, 179).
Aa
White text reads best on this color (6.36:1).
About this color
#5155B3 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.146 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.038 away. White text reads best on it, at 6.36:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.30:1 |
| White text | 6.36:1 |
Values
| HEX | #5155B3 |
| RGB | rgb(81, 85, 179) |
| HSL | hsl(238, 39%, 51%) |
| OKLCH | oklch(49.6% 0.146 277.8) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #5155B3 | 6.36:1 | AA | Lc -86.5 | Fine for body text |
| Black text on #5155B3 | 3.30:1 | AA large text | Lc 22.7 | Dividers and decoration only |
| #5155B3 text on white | 6.36:1 | AA | Lc 81.4 | Fine for body text |
| #5155B3 text on black | 3.30:1 | AA large text | Lc -20.5 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D2D7F4
oklch(88.4% 0.04 277.8)
-
Step 300
300
#B5BDEF
oklch(80.9% 0.071 277.6)
-
Step 400
400
#9099E6
oklch(70.7% 0.113 278)
-
Step 500
500
#767EDF
oklch(63.1% 0.145 277.8)
-
Step 600
600
#6065CD
oklch(55.6% 0.158 277.9)
-
Step 700
700 (this color)
#5155B3
oklch(49.6% 0.146 277.8)
-
Step 800
800
#41458F
oklch(42.7% 0.12 277.7)
-
Step 900
900
#373B72
oklch(37.8% 0.093 277.8)
-
Step 950
950
#202343
oklch(27.1% 0.059 277.6)
#5155B3 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #2263B6 | 0.055 |
| Deuteranopia (no green cones) | #115BB1 | 0.059 |
| Tritanopia (no blue cones) | #226A7C | 0.127 |
| Achromatopsia (no color) | #5F5F5F | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5155B3
#5155B3
oklch(49.6% 0.146 277.8)
- #726200
#726200
oklch(49.7% 0.103 98)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #5155B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.038
- Slate Blue #6A5ACD ΔE 0.057
- Bluey Purple #6241C7 ΔE 0.059
- French Blue #436BAD ΔE 0.062
- Dark Periwinkle #665FD1 ΔE 0.062
- Dusky Blue #475F94 ΔE 0.062
- Warm Blue #4B57DB ΔE 0.063
- Light Indigo #6D5ACF ΔE 0.063
Use #5155B3 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.